No one is or isn't magick, magick is all around us, anyone is able to seek its assistance, but no one can be magick (in the sense of being special, being the only one who can "use" it, because they are different from everyone else).
Anyone can learn how to receive magickal help, the people who choose to believe and seek magickal aid refer to themselves as witches/wizards and other elaborate names, but many people don't refer to themselves as anything at all, it is all personal choice.